Model 00617 sensor stuck at high temperature and F/C switch doesn't work

Just changed batteries and now the sensor is stuck at a very high temperature (>120-deg F) and the F/C switch on sensor doesn't work. The transmission to the indoor unit works fine and the F/C switch works fine. I have tried the range of standard fixes - new batteries, take batteries out, switch channels, put sensor battery in first etc.

•Verify batteries are fresh. The battery expiration date should be at least 6 years out. Batteries can lose 3% power or more every year in storage.

•Heavy duty, extra strength or generic / store brand batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the way these types of batteries disperse power. Each battery should not exceed 1.6 volts.

•Rechargeable batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the voltage instability of these types of batteries.

•Mixing different battery types (brands, old/new, etc.) is not recommended.

Perform a hard reset:

1.Bring both the sensor and display unit indoors side by side.

2.Remove batteries from the sensor.

3.Remove batteries from the display unit and unplug the AC adapter (if applicable).

4.Wait 2 minutes to ensure any remaining battery power is discharged from both units.

5.Change the A-B-C Channel on both the display and sensor making sure they both match.

6.Reinstall batteries in outdoor sensor first.

7.Reinstall batteries in display unit second.

8.Let the units sit within a couple feet of each other for 30 minutes when comparing for accuracy * The display should receive the signal within several minutes.

9.After a connection has been established you may place the sensor outdoors.*If the signal connection fails after the units are separated try a new or different location for the display unit, the sensor or both.